Instead of ratting on about something you have never looked at go into the comparison charts and see for your self.

You would have to be blind and inept not to see the massive noise in those samples.

why not deal with the particular points, eg this one:

Still, I am sure there will be some people who will never shoot a real photo at ISO 6400 on their D600 as long as they own the camera (but will shoot plenty of test shots to show it off!) but will still buy one because it is better than a different camera at that ISO!